Machine for truing or dressing grinding wheels by reproduction from a pattern



Nov. 1, 1955 K. SCHULTZE 2,722,212

MACHINE FOR TRUING OR DRESSING GRINDING WHEELS BY REPRODUCTION FROM A PATTERN Filed May 18, 1953 I lmmmixgggjmm United States Patent Ofiice Knrt .Sehn t e Ber ine nsn, erm n as i ne t Erna'Lindner, born Pfejlfer, Berlin-Frohnau, Germany vAPP i atio.n May .8, 1-953, Serial :No- 35 ,510 C aim Prior y, app i ati n Germ y M y 29, 1

5 Claims. c1. 125-41 For shaping grinding discs of grinding machines, es-

pecially thread grinding machines, often pattern controlled truing or dressing apparatus must be used. In such machines the diamond carrier is guided in a known manner in the longitudinal (axial) direction of the grinding disc along a thin plane pat-tern whereby the diamond produces the desired profile of the grinding disc. Such truing devices, however, are not adapted for profiles having -a larger angle of inclination than 45 It has also been suggested to move the plane pattern in opposite direction to the movement of the diamond carrier whereby the profile of the pattern is extended or stretched in the longitudinal direction and the angle under which the diamond carrier moves upward has a smaller inclination. As, however, the total length of the pattern is limited for want of space the pattern has scarcely been extended for more than according to a, proportion of 2:1. The angle of the profile inclination a. depends on the said angle a at which the diamond carrier moves and of said proportion of extension i1 according to the formula not or =cot c;

The efior en ven angl of profile inc ina ion .of a out ,is obtainable with an angle of 45* at which the diamond c rr e i move According to the inven o a p file v clin i n angle 9f 5- and l m y be obtai ed i h apa ern ext nde er stre c ed i a prac i al y obta n ble Proport on .of

an wi h an agle e; 5 a which the d amo d ca rie m ves.

For this purpose, according to the invention, the pattern is curved or curves during its movement ,suehwise tha h patt rn whi h is hu elon ate nd there y allows a steeper profile inclination angle remains practically always within the space provided for the truing device.

Many embodiments cf the invention are possible.

ranged in a certain distance from each other. Also in such case one of the drums may be attached to the same shaft with the driving element of the longitudinal slide.

Further on, theoretically the flexible pattern band may The simplest example of this ,sug-. gestion is an endless .band running around two drums arlPetented .Nev, 1,19

be guided around more than two guiding elements. Inst d 9f e in addition e in e s a o the od ha in a other share may he nse as gu di elem nts- .Fe the sake of er p n s it i us e m nt oned th it is not required to use always an endless hand. In m r cases i will b sufi e t t form the p tter as an elongated body having two ends. It is only essential that the patt n pa es du ing t e Wo k ng h ough cur paths,-

h a c mpany d awin ow tw mbodimen of the invention by way 9f example.

Fig. 1 is a vertical section through a truing .or dressing apparatus according to the invention, the section be n ak n a plane rec an to the ax s of th r nding disc. V

Fig. 2 illustrates the dependency of the profile inclinatien an e e he a e s under wh c the diame r er m ve and n h p epe i of n on o t e pa ernigs- 3-5 sh a p e Pro es dap d o e t ied er ressed, s id pr file having a eme y t p a l e in in tio Fig.6 shows schematically a flexible pattern running around two guiding cylinders, in the maimer of an endless h nd 2' 2 In Fig. 1 the grinding disc to be .trued or dressed is es gnated wit the re ere c umer 1- he a :Pl t or lower slide 2 is fastened at the place provided for the ruin de shi l wer slide gu es t r ppe sl d 3 h may be adjusted in the direction toward the grinding disc by means of a hand Wheel 4, a spindle 5 and put .6. The upper slide 3 is provided with a dovetailed gu de ;3 ertenel hg n t e l u n e t on th [grind ng dise 1 and. gu ding the ngi udina eepyin slid 7. This longitudinal copying slide guides the diamond carrier 8 forming the transverse copying slide and carrying the diamond -9 by means of the diamond holder ll). In the longitudinal copying slide 7 a shaft 11 of a pinion 11' s upner e i h 'eh e a n a e fixedt the upper slide 3. The shaft 11 further carries a drum 3 c h h xchan eab e p t rn ,1 fastened- The pattern 14 made .of a band is placed around said dru n whe eb it obtains a cy i r a shape Th e t de h t i patt r ha a co t oll ng su f ce P eded w h a ec es'er rec sse c sp n ing t he long tudinal ext nded Profile h spring 15 pre e the ent ying n er or pa te n e lew 1 against th pa te n 1L t e incremen bei tr mi te y he el a d car i 3 and the helsle l7- Ih d um i pr wi a r m l8 t othed like a worm he l and me h with a worm 8: By t n n this We 8 th dru 13 and simu taneous y the P'at e v and he s ft cf t e pinie 1. i w etete he eby th l ng udina copy ng sl d rnevet in the lensitue nel in ti l di ecti n c th grinding disc whil the pat-te n Ine es alon the heavin finger or pattern follower 1.6 and con rol the dia en carrierS in the transverse (radial) direction .of the grinding disc. In this way the desired profile of the grinding disc 1 is produced. As already mentioned the largestobta inable inclination angle of the profile with a given maximum angle of the curve along which the copying finger slides only depends the proportion of the longitud na ex ension 9f t e pa e The elations are i u tr e in Fig: 2-

n th fi ure la esignates he pat ern is theahg e th en e'el ng wh ch the eepyinafinger slides an a the inclination angle of the profile of the grinding disc. If for a partial profile depth t the length of the path, performed by longitudinal copying slide 7 is equal to S and the length of the path of the pattern 14 is equal to S then the required proportion of the longitudinal extension of the pattern 1 S1 cot a The proportion of the said longitudinal extension i1 corresponds to the proportion of the mean diameter of the pattern I K (Fig. 1) to the diameter I of the pitch circle of the pinion 11.

The worm shaft 18 may be driven by hand or automatically, e. g. by a motor 19.

Fig. 6 illustrates another embodiment of the invention. Here an endless flexible pattern 20 is used running around two cylindrical guiding bodies 21 and 22. One of the cylindrical bodies, e. g. the cylinder 21, may be attached to the same shaft with the driving element of the longitudinal slide, in a similar way as described with respect to the first embodiment. In this case the second guiding cylinder 22 is driven suitably by this shaft.

What I claim is:

1. A machine for truing or dressing wheels by reproduction from a pattern, comprising: a support, a slide movably mounted on said support for movement in a direction parallel to the longitudinal axis of the wheel to be trued, a shaft rotatably mounted on said slide, the axis of said shaft extending perpendicular to the direction of movement of said slide, cooperating engaging means connected with said shaft and said support for causing a movement of said slide relative to said support upon a rotation of said shaft, a drum secured to said shaft, a band-like pattern mounted on said drum in a cylindrical shape, said band-like pattern having a controlling surface of predetermined shape at one of its edges, driving means connected with said drum, a tool holder reciprocably mounted on said slide for movements towards and away from the wheel to be trued, said tool holder being arranged for carrying a truing tool, a pattern follower connected with said reciprocable tool holder and arranged for cooperation with said controlling surface on said pattern, and means for holding said pattern follower in engagement with said controlling surface.

2. A machine for truing or dressing wheels by reproduction from a pattern, comprising: a support, a slide movably mounted on said support for movement in a direction parallel to the longitudinal axis of the wheel to be trued, a band-like pattern having a controlling surface of predetermined shape extending in the direction of the longitudinal axis of the band-like pattern, at least one cylindrical body rotatably mounted on said slide for rotation about an axis perpendicular to the direction of movement of said slide, said band-like pattern being trained around said cylindrical body, driving means associated with said slide and said cylindrical body for moving same in predetermined relationship to each other, a tool holder reciprocably mounted on said slide for movements towards and away from the wheel to be trued, said tool holder being arranged for carrying a truing tool, a pattern follower connected with said reciprocable tool holder and arranged for cooperation with said controlling surface on said pattern, and means for holding said pattern follower in engagement with said controlling surface, said pattern being in the shape of an endless band and being trained around a pair of cylindrical bodies.

3. A machine for truing or dressing wheels by reproduction from a pattern, comprising: a support, a slide movably mounted on said support for movement in a direction parallel to the longitudinal axis of the wheel to be trued, a band-like pattern having a controlling surface of predetermined shape extending in the direction of the longitudinal axis of the band-like pattern, at least one cylindrical body rotatably mounted on said slide for rotation about an axis perpendicular to the direction of movement of said slide, said band-like pattern being trained around said cylindrical body, driving means associated with said slide and said cylindrical body for moving same in predetermined relationship to each other, a tool holder reciprocably mounted on said slide for movements towards and away from the wheel to be trued, said tool holder being arranged for carrying a truing tool, a pattern follower connected with said reciprocable tool holder and arranged for cooperation with said controlling surface on said pattern, and means for holding said pattern follower in engagement with said controlling surface, and a power drive connected with said driving means for actuating same.

4. A machine for truing or dressing wheels by reproduction from a pattern, comprising: a support, a slide movably mounted on said support for movement in a direction parallel to the longitudinal axis of the wheel to be trued, a band-like pattern having a controlling surface of predetermined shape extending in the direction of the longitudinal axis of the band-like pattern, at least one cylindrical body rotatably mounted on said slide for rotation about an axis perpendicular to the direction of movement of said slide, said band-like pattern being trained around said cylindrical body, driving means associated with said slide and said cylindrical body for moving same in predetermined relationship to each other, a tool holder reciprocably mounted on said slide for movements towards and away from the wheel to be trued, said tool holder being arranged for carrying a truning tool, a pattern follower connected with said reciprocable tool holder and arranged for cooperation with said controlling surface on said pattern, and means for holding said pattern follower in engagement with said controlling surface, said tool being movably and adjustably mounted on said tool holder.

5. A machine for truing or dressing wheels by reproduction from a pattern, comprising: a support, a slide movably mounted on said support for movement in a direction parallel to the longitudinal axis of the wheel to be trued, a band-like pattern having a controlling surface of predetermined shape extending in the direction of the longitudinal axis of the band-like pattern, at least one cylindrical body rotatably mounted on said slide for rotation about an axis perpendicular to the direction of movement of said slide, said band-like pattern being trained around said cylindrical body, driving means associated with said slide and said cylindrical body for moving same in predetermined relationship to each other, a tool holder reciprocably mounted on said slide for movements towards and away from the wheel to be trued, said tool holder being arranged for carrying a truing tool, a pattern follower connected with said reciprocable tool holder and arranged for cooperation with said controlling surface on said pattern, and means for holding said pattern follower in engagement with said controlling surface, said pattern follower being movably and adjustably connected with said tool holder.

References Cited in the file of this patent UNITED STATES PATENTS 6,843 Goodman Nov. 6, 1849 297,454 Schwitter Apr. 22, 1884 845,305 Liebert Feb. 26, 1907 1,008,919 Klehe Nov. 14, 1911 1,132,920 Fay Mar. 23, 1915 1,571,323 Cole Feb. 2, 1926 1,905,390 Lindner Apr. 25, 1933 2,276,260 Turrettini Mar. 10, 1942 2,596,555 Hoglund May 13, 1952 

